2 Copyright (C) 2005 Michael Ahlberg, Måns Rullgård
4 Permission is hereby granted, free of charge, to any person
5 obtaining a copy of this software and associated documentation
6 files (the "Software"), to deal in the Software without
7 restriction, including without limitation the rights to use, copy,
8 modify, merge, publish, distribute, sublicense, and/or sell copies
9 of the Software, and to permit persons to whom the Software is
10 furnished to do so, subject to the following conditions:
12 The above copyright notice and this permission notice shall be
13 included in all copies or substantial portions of the Software.
15 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
16 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
17 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
18 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
19 HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
20 WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
22 DEALINGS IN THE SOFTWARE.
26 #include "libavutil/avstring.h"
27 #include "libavutil/bswap.h"
28 #include "libavutil/dict.h"
29 #include "libavcodec/get_bits.h"
30 #include "libavcodec/bytestream.h"
31 #include "libavcodec/vorbis_parser.h"
35 #include "vorbiscomment.h"
37 static int ogm_chapter(AVFormatContext *as, uint8_t *key, uint8_t *val)
39 int i, cnum, h, m, s, ms, keylen = strlen(key);
40 AVChapter *chapter = NULL;
42 if (keylen < 9 || sscanf(key, "CHAPTER%02d", &cnum) != 1)
46 if (sscanf(val, "%02d:%02d:%02d.%03d", &h, &m, &s, &ms) < 4)
49 avpriv_new_chapter(as, cnum, (AVRational){1,1000},
50 ms + 1000*(s + 60*(m + 60*h)),
51 AV_NOPTS_VALUE, NULL);
53 } else if (!strcmp(key+9, "NAME")) {
54 for(i = 0; i < as->nb_chapters; i++)
55 if (as->chapters[i]->id == cnum) {
56 chapter = as->chapters[i];
62 av_dict_set(&chapter->metadata, "title", val,
63 AV_DICT_DONT_STRDUP_VAL);
72 ff_vorbis_comment(AVFormatContext * as, AVDictionary **m, const uint8_t *buf, int size)
74 const uint8_t *p = buf;
75 const uint8_t *end = buf + size;
79 if (size < 8) /* must have vendor_length and user_comment_list_length */
82 s = bytestream_get_le32(&p);
84 if (end - p - 4 < s || s < 0)
89 n = bytestream_get_le32(&p);
91 while (end - p >= 4 && n > 0) {
95 s = bytestream_get_le32(&p);
97 if (end - p < s || s < 0)
104 v = memchr(t, '=', s);
115 tt = av_malloc(tl + 1);
116 ct = av_malloc(vl + 1);
120 av_log(as, AV_LOG_WARNING, "out-of-memory error. skipping VorbisComment tag.\n");
124 for (j = 0; j < tl; j++)
125 tt[j] = av_toupper(t[j]);
131 if (!ogm_chapter(as, tt, ct))
132 av_dict_set(m, tt, ct,
133 AV_DICT_DONT_STRDUP_KEY |
134 AV_DICT_DONT_STRDUP_VAL);
139 av_log(as, AV_LOG_INFO, "%ti bytes of comment header remain\n", end-p);
141 av_log(as, AV_LOG_INFO,
142 "truncated comment header, %i comments not found\n", n);
144 ff_metadata_conv(m, NULL, ff_vorbiscomment_metadata_conv);
150 /** Parse the vorbis header
151 * Vorbis Identification header from Vorbis_I_spec.html#vorbis-spec-codec
152 * [vorbis_version] = read 32 bits as unsigned integer | Not used
153 * [audio_channels] = read 8 bit integer as unsigned | Used
154 * [audio_sample_rate] = read 32 bits as unsigned integer | Used
155 * [bitrate_maximum] = read 32 bits as signed integer | Not used yet
156 * [bitrate_nominal] = read 32 bits as signed integer | Not used yet
157 * [bitrate_minimum] = read 32 bits as signed integer | Used as bitrate
158 * [blocksize_0] = read 4 bits as unsigned integer | Not Used
159 * [blocksize_1] = read 4 bits as unsigned integer | Not Used
160 * [framing_flag] = read one bit | Not Used
163 struct oggvorbis_private {
165 unsigned char *packet[3];
166 VorbisParseContext vp;
173 fixup_vorbis_headers(AVFormatContext * as, struct oggvorbis_private *priv,
176 int i, offset, len, err;
179 len = priv->len[0] + priv->len[1] + priv->len[2];
180 ptr = *buf = av_mallocz(len + len/255 + 64);
184 offset += av_xiphlacing(&ptr[offset], priv->len[0]);
185 offset += av_xiphlacing(&ptr[offset], priv->len[1]);
186 for (i = 0; i < 3; i++) {
187 memcpy(&ptr[offset], priv->packet[i], priv->len[i]);
188 offset += priv->len[i];
189 av_freep(&priv->packet[i]);
191 if ((err = av_reallocp(buf, offset + FF_INPUT_BUFFER_PADDING_SIZE)) < 0)
196 static void vorbis_cleanup(AVFormatContext *s, int idx)
198 struct ogg *ogg = s->priv_data;
199 struct ogg_stream *os = ogg->streams + idx;
200 struct oggvorbis_private *priv = os->private;
203 for (i = 0; i < 3; i++)
204 av_freep(&priv->packet[i]);
208 vorbis_header (AVFormatContext * s, int idx)
210 struct ogg *ogg = s->priv_data;
211 struct ogg_stream *os = ogg->streams + idx;
212 AVStream *st = s->streams[idx];
213 struct oggvorbis_private *priv;
214 int pkt_type = os->buf[os->pstart];
217 os->private = av_mallocz(sizeof(struct oggvorbis_private));
225 if (os->psize < 1 || pkt_type > 5)
230 if (priv->packet[pkt_type>>1])
232 if (pkt_type > 1 && !priv->packet[0] || pkt_type > 3 && !priv->packet[1])
235 priv->len[pkt_type >> 1] = os->psize;
236 priv->packet[pkt_type >> 1] = av_mallocz(os->psize);
237 memcpy(priv->packet[pkt_type >> 1], os->buf + os->pstart, os->psize);
238 if (os->buf[os->pstart] == 1) {
239 const uint8_t *p = os->buf + os->pstart + 7; /* skip "\001vorbis" tag */
240 unsigned blocksize, bs0, bs1;
246 if (bytestream_get_le32(&p) != 0) /* vorbis_version */
249 st->codec->channels = bytestream_get_byte(&p);
250 srate = bytestream_get_le32(&p);
251 p += 4; // skip maximum bitrate
252 st->codec->bit_rate = bytestream_get_le32(&p); // nominal bitrate
253 p += 4; // skip minimum bitrate
255 blocksize = bytestream_get_byte(&p);
256 bs0 = blocksize & 15;
257 bs1 = blocksize >> 4;
261 if (bs0 < 6 || bs1 > 13)
264 if (bytestream_get_byte(&p) != 1) /* framing_flag */
267 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
268 st->codec->codec_id = AV_CODEC_ID_VORBIS;
271 st->codec->sample_rate = srate;
272 avpriv_set_pts_info(st, 64, 1, srate);
274 } else if (os->buf[os->pstart] == 3) {
276 ff_vorbis_comment(s, &st->metadata, os->buf + os->pstart + 7, os->psize - 8) >= 0) {
277 // drop all metadata we parsed and which is not required by libvorbis
278 unsigned new_len = 7 + 4 + AV_RL32(priv->packet[1] + 7) + 4 + 1;
279 if (new_len >= 16 && new_len < os->psize) {
280 AV_WL32(priv->packet[1] + new_len - 5, 0);
281 priv->packet[1][new_len - 1] = 1;
282 priv->len[1] = new_len;
287 st->codec->extradata_size =
288 fixup_vorbis_headers(s, priv, &st->codec->extradata);
289 if ((ret = avpriv_vorbis_parse_extradata(st->codec, &priv->vp))) {
290 av_freep(&st->codec->extradata);
291 st->codec->extradata_size = 0;
299 static int vorbis_packet(AVFormatContext *s, int idx)
301 struct ogg *ogg = s->priv_data;
302 struct ogg_stream *os = ogg->streams + idx;
303 struct oggvorbis_private *priv = os->private;
306 /* first packet handling
307 here we parse the duration of each packet in the first page and compare
308 the total duration to the page granule to find the encoder delay and
309 set the first timestamp */
312 uint8_t *last_pkt = os->buf + os->pstart;
313 uint8_t *next_pkt = last_pkt;
314 int first_duration = 0;
316 avpriv_vorbis_parse_reset(&priv->vp);
318 for (seg = 0; seg < os->nsegs; seg++) {
319 if (os->segments[seg] < 255) {
320 int d = avpriv_vorbis_parse_frame(&priv->vp, last_pkt, 1);
322 duration = os->granule;
328 last_pkt = next_pkt + os->segments[seg];
330 next_pkt += os->segments[seg];
332 os->lastpts = os->lastdts = os->granule - duration;
333 s->streams[idx]->start_time = os->lastpts + first_duration;
334 if (s->streams[idx]->duration)
335 s->streams[idx]->duration -= s->streams[idx]->start_time;
336 s->streams[idx]->cur_dts = AV_NOPTS_VALUE;
337 priv->final_pts = AV_NOPTS_VALUE;
338 avpriv_vorbis_parse_reset(&priv->vp);
341 /* parse packet duration */
343 duration = avpriv_vorbis_parse_frame(&priv->vp, os->buf + os->pstart, 1);
345 os->pflags |= AV_PKT_FLAG_CORRUPT;
348 os->pduration = duration;
351 /* final packet handling
352 here we save the pts of the first packet in the final page, sum up all
353 packet durations in the final page except for the last one, and compare
354 to the page granule to find the duration of the final packet */
355 if (os->flags & OGG_FLAG_EOS) {
356 if (os->lastpts != AV_NOPTS_VALUE) {
357 priv->final_pts = os->lastpts;
358 priv->final_duration = 0;
360 if (os->segp == os->nsegs)
361 os->pduration = os->granule - priv->final_pts - priv->final_duration;
362 priv->final_duration += os->pduration;
368 const struct ogg_codec ff_vorbis_codec = {
369 .magic = "\001vorbis",
371 .header = vorbis_header,
372 .packet = vorbis_packet,
373 .cleanup= vorbis_cleanup,